3,4-dihydro-1-methyl-11h-1,4-oxazino(4,3-b)-1,2-benzothiazin-11-one 6,6-dioxide

ABSTRACT

The compound herein is 3,4-dihydro-1-methyl-11H-1,4-oxazino(4,3b)-1,2-benzothiazin-11-one 6,6-dioxide, useful for its ultraviolet absorbing properties.

States Patent [191 [111 3,821,212 June 28, 1974 [73] Assignee: McNeil Laboratories, Inc., Fort Washington, Pa.

[22] Filed: Oct. 2, 1972 [21] Appl. No.: 294,118

[52] US. Cl 260/243 R, 260/45.8, 252/300, 117/333 [Sl] Int. Cl C07d 93/02 [58] Field of Search 260/243 R [5 6] References Cited UNITED STATES PATENTS 3,408,347 10/1968 Shave] et a]. .Q 260/243 Primary Examiner-John M. Ford Attorney, Agent, or FirmSalvatore R. Conte [57] ABSTRACT The compound herein is 3,4-dihydro-l-methyl-l1H- l ,4-oxazino[4,3-b]- l ,2-benz0thiazin-1 l-one 6 ,6-

dioxide, useful for its ultra-violet absorbing properties. 1 Claim, N0 Drawings 

